Metal shears



J. JENSEN METAL SHEARS Nov. 6, 1923.

Filed Sept. 17; 1927 w l hgpnifi dob/m Jevwam I9 WW a p w gwgm Z n A, A9515?! A? A Patented Nov.

JO N EN E 'I seamen, mnols, 'AssieNoB s WHI N ETAL freon com I may, ornocxronn, mentors n oonnonnrron or nnmoxs.

airmen snnnins;

a lication filed september 17. 1927. Serial No. 220.;079

The invention relates to 1netal-shears and particularly to 'hanil operated shears.

One'object isto providemeans .for .positioningbent shapes of material, such as an angle bar, in relation to the shears to ern'iit cutting the i or flanges thereof.

Altai-then ,o-jcct to provide a structure for supporting and operating the shear blades which is Li d against strain, compact in fOlfUfl anddurablein' o1 ,Jrat ion.

=(lther objects.aiidadvantages will. be apparent in the lollowingdescript-ion of a .pretered embodiment of the invention ,WlllCll 1S illustrated in the. accompanying drawings.

In the drawings Figure .1 represents a side ele *atlon oi' the shears :and Fig. Qmepresents a front en d elevation.

Fig; 8 is a fractional, cross sectional View taken in elevation on the planes of the line '3-3 in Figured. i

. Fig. -lisasectional planview taken on the plane of theline4-4 in Figure l. r

i In the drawings the numeral 1 indicates a ln'eferably integralfraine struoturelhaving a lower portion Bland an upper. portion 3, the latter being vertically olfs'et from the lower portion. The rframestruoture may be provided with re-enforcing ribs indicated at 4, of which one forms 'a horizontal table 5 on the loweriportion 2 of the structure, andere tendingalong the line of offset between the two portions. 1 l

from the lower portion to which may be se-.

cured a pair of angle bars 7, asflby bolts 8 or other suitable means, the angle barsforming a pedestal for the support of the shears; The angle 'bars mayiibei securedyil desired, .to a table or other stationary support.-

The front portion of the frame structure is provided With-a slot 9 extending substantial- 1y inward oi" the structure and positioned along the line ofofi'set between the upper and lower portions of the frame, the table 5 forrn ing the lower margin of the slot. The slot 9 is of suitable Width to admit inaterial to be cut by the shears to: the limit of thickness for which the shears are adapted.

The front portion of the upper portion 8 of the frame is provided with a vertically disposed recess 10 extendingto the slot 9 to accommodate a reciprocatoryblade holder 11 positioned therein. The blade holder 11 is laterally supported in suitableslide-Ways l2 bolts 14.

formed in :the lateral margins of the recess 10. The holder 11 ;is retained in the recess 310 byuneans-of aremoveble plate 13 suitably securedto the trame, preferably-by ieans of The lower marginfoitheholder 11 is pret erably formed in angular rehition to the slot 9 and providedWithscutting bin-(1015 suil- .ablysecures to the holder asby, means of screws 16. The cutting blade 15 is coopera t'ively associated vitha econd cutting blade 17 Secured-to thelowerportion 2 lofthe fr-aine withitscuttingedge extending into the slot 9 slightly eoove the table ,5. The second or lower blade -17. i's preferably seeuredfio the frame by neans ota pair of screws 18, and ad ustment off'the blade 17 inrelationto the upper blade '15 maybe accomplished by of apair of adjusting screwsli), mounted in the frame structure and engilgillgthef blade 17' above the supporting screws 18.. The counter-action of the supportingscrews and theadjustingscrews el'ifectthe ;rigid positioning of the blade l i in. proper shearing relation to the upper-blade-lo and may be ad justed to compensate "for Wear-in the blades. The-retaining plate 13-is provided at its lower inargiuwitha pairoif upwardly extending" recesses 20, exposing thela'teralface of? the upper bladels and permittingthe introduction oibent shapes of metalst-ook to be cut.- The recesses 20 are particularly adapt ed for the, angular cuttingot' one legfof an angle. iron.,,l 1ar--at anyang'le to the other leg which may be desired. the other leg of the her being positioned within one of the recesses in abutment with; theaupper blede 15 so that the cutis made precisely at the end of the bar; Thisprovision for theangulai' cutting of either or bothl rotone end of an anglefbar is 1 especially ad ,antageo us .in; cutting such bars fo'rflcorner joints, in structures in 'vhich the bars are used as illustrated in Fig. 4: wherein A represents an angle bar.

The retaining plate 13 provided with guide tongue portions 21 formed between the recesses 20 and extending to the upper Iuargin of the slot 9, by which is prevented the insertion between the bladesof material stool; of greater thickness than the designed cutting capacity of the shears.

The reciprocatory movement of the blade holder 11, by) which the shearing operation is effected, accomplished by ineansot' afretatable member operatively su1: portedby the ill) lid

upper portion of the frame and the retaining plate, and having an eccentric connection with the holder 11. The rotatable operating member comprises a pair of laterally spaced concentric plates 22 having cylindrical, marginal contour and joined by means of a bandle support 23 extending partially between the plates and preferably of integral construction with those plates.

The cylindrical plates 29. are respectively supported in bearings provided in the upper portion 3 of the frame and in the retain ng plate 1 3, the space between the cylindrical plates being alined with the recess 10 within which is supported the blade holder 11. The bearings provided for the cylindrical plates '22 are preferably of the antifrict1on type and comprise respectively a series of rollers 2st supported in a suitable bearing channel in the frame structure and the retaining plate. The rollers 2% are retained in operative position by means of conventional retaining rings 25, and suitable lateral covers 26 are respectively secured to the frame structure and the retaining plate as by means of screws 26. In Figure 1 the front cover 2t has been ren'lovedl Manual rotation of the cylindrical plates 22 with their integral handle support 23 is preferably effected by mearcs of the removablehandlebar 27 positioned in a socket provided in the handle support.

The blade holder 11 extends at its upper end between the cylindrical plates 22, and is provided with a horizontally elongated bearing recess 98 through which extends a pm 29 rigidly supported at its ends in the cylindrical plates 22, the axis ofthe pin 29 being positioned in eccentric relation to the ax s of the cylindrical plates. The pin 29 carries a bearing sleeve 30 positioned in and in operable contact with the bearing recess 28 formed in the blade holder. The sleeve 30 functions as an anti-f 'iction roller between the pin 29 and the bearing surfaces of the holder 11 about the recess 28.

The upper end of the blade holder 11 is preferably provided with an end pocket 31 positioned rear "ardly of the bearing recess and adapted to accommodate the portion of the handle support 23 extending between the cylindrical plates 22 when the bearing support is rotated to lift the blade holder.

The short radius of the eccentrically positioned pin 29 with its antifriction roller 30 effects a powerful and durable means for actuating the blade holder 11 in the cutting operation of the shears. The anti-friction roller bearing support for the cylindrical plates 22 further largely contribute to an exceptionally easy operation of the cutting blades which is essential in the satisfactory performance of a manually operated metalshears.

In operation, the handle is rotated to upright position as illustrated in Figure l which lifts the blade holder and its suppm't'cd upper blade for the introduction of the material in the slot 9. The cutting operation is effected by the forward and downward rotation of the handle. thereby forcing down the upper cutting blade to effect the shearing of the stock. In the use of progressive cuts on sheet material one portion may advance along the upper side of the table 5 and the other sheared portion advance beneath the rib 32 on the opposite side of the offset frame structure.

I claim as my invention:

1. In metal shears, the combination of a stationary blade, a movable blade, and a plate positioned in substantially parallel spaced relation to said stationary blade to limit the dimension of material to be interposed be tween said blades for cutting, said plate havmg a recess adapted to admit one portion of a bent piece of material in order to position another portion of said piece of material between said blades for cutting closely proximate to said portion admitted to said recess.

2. In metal shears, the combination of a frame having a material limiting slot formed therein, a stationary blade supported at one margin of said slot, a movable blade supported for operation across the opposite margin of said slot in cutting association with said stationary blade, and a plate supported with a marginal edge adjacent said slot, said plate having a recess extending from said slot adjacent the path of movement of said movable blade.

In testimony whereof, I have hereunto affixed my signature.

JOHN JENSEN. 

